Visualization of one-dimensional diffusion and spontaneous segregation of hydrogen in single crystals of VO2
Kasirga, T. S.
Coy, J. M.
Park, J. H.
Cobden, D. H.
Institute of Physics Publishing
345708-1 - 345708-7
Item Usage Stats
MetadataShow full item record
Hydrogen intercalation in solids is common, complicated, and very difficult to monitor. In a new approach to the problem, we have studied the profile of hydrogen diffusion in single-crystal nanobeams and plates of VO2, exploiting the fact that hydrogen doping in this material leads to visible darkening near room temperature connected with the metal-insulator transition at 65 ï¿½C. We observe hydrogen diffusion along the rutile c-axis but not perpendicular to it, making this a highly one-dimensional diffusion system. We obtain an activated diffusion coefficient ∼ 0.01 e-0.6eV/kBT cm2s-1, applicable in metallic phase. In addition, we observe dramatic supercooling of the hydrogen-induced metallic phase and spontaneous segregation of the hydrogen into stripes implying that the diffusion process is highly nonlinear, even in the absence of defects. Similar complications may occur in hydrogen motion in other materials but are not revealed by conventional measurement techniques.
Metal-insulator transition-1D diffusion
Metal insulator boundaries
Semiconductor insulator boundaries
Near room temperature
Metal insulator transition
Published Version (Please cite this version)https://doi.org/10.1088/0957-4484/27/34/345708
Showing items related by title, author, creator and subject.
Aydin, M.; Uyar T.; Tasdelen, M. A.; Yagci Y. (John Wiley and Sons Inc., 2015)An 2-ureido-4[1H]pyrimidinone (UPy) motif with self-association capability (through quadruple hydrogen bonds) was successfully anchored onto montmorillonite clay layers. Polymer/clay nanocomposites were prepared by specific ...
Niaz S.; Abbasian H.; Badar M.A.; Anwar-ul-Haq M.; Karayel A. (Taylor and Francis Ltd., 2017)We present ab initio study using dispersion-corrected density functional theory calculations to investigate the hydrogen interaction with Ti-coated, one end closed, single-walled carbon nanotube (SWCNT). Our results ...
Ultrasensitive electrospun fluorescent nanofibrous membrane for rapid visual colorimetric detection of H2O2 Senthamizhan A.; Balusamy, B.; Aytac Z.; Uyar T. (Springer Verlag, 2016-02)We report herein a flexible fluorescent nanofibrous membrane (FNFM) prepared by decorating the gold nanocluster (AuNC) on electrospun polysulfone nanofibrous membrane for rapid visual colorimetric detection of H2O2. The ...